olakk



To all whom t may concern `rAMrs M. CLARK, `or LANoAs'rEa, rnmvsYLvAmA.`

f rLoUnIivG APPARATUS. d

l Specification of Letters Patent No1. 81,089, datiedilvfay` 1`3,11-8`51.I

Be it `known that I, JAMES M. CLARK, of Lancaster, in the county of Lancaster and State of Pennsylvania, have invented certain Improvementsin Grinding and Bolting, and that `the following is a full, clear,

\ and exact description of the principle or character `which distinguishes them from all other things before known and `of theusual manner of `making, modifying,`and using the same,reference beinghad to the accomi panying drawings, of which-T Figure l is an elevation, Fig. 2.a top plan. Fig. 3 a horizontal section, and Fig. 4 a vertical section.

My several improvements have for their objects the production of a compact flouring mill in which all the operations of grinding,

bolting, &c., are perfectly performed and the different products of the wheat separated and delivered at different openings; and the whole apparatus being contained in a few cubic feet, and from the` small number of parts and their concentric arrangement a great saving of power is experienced by obviating friction and at the same time each part is made capable of accurate adjustment.

In the drawings (a) is the upper bur stone which is fixed to a cast iron frame (b) which also supports and contains thewhole apparatus.

(d) is the hopper through which the wheat falls between the stones.

(c) is the lower bur stone `which revolves upon the upright shaft (e) which is driven by a belt around the pulley (f). The upper end of the shaft (c) runs in an adjustable collar (g) and the lowerdend in a step (it). This step has a screw cut on its exterior which works in afemale screw in the cross bar (i). As the stones wear away the shaft (e) is elevated by turning the step, by

means of a wrench, atthe same time a new surface of the step Ais brought to sustain the lateral wearf'of the end of the shaft which is always in one direction owing `to the tension ofthe driving belt. The wheat escapes at the periphery of the stones into the chamber (le) in which -is a revolving hopper boy (Z) which collects and slowly conveys the iour to the center hole in the floor (7%); at the same time the wheat becomes lcooled by the air passing over it to supply the fan below. After grinding' and cooling the flour falls into the chamber (n) y which is surrounded byan upright `cylinder `of wire gauze (o), which may be composed of cylinders of differentdegrees of neness lthose lowest in posit-ion beingthe coarsest.

Within the bolting cylinder (0)` is the re-` .volving fan (p) having adjustable arms ,which may be` furnished with brushes `on their; outer edges. The arms of the fan (p) are attachedbyadjustable fastenings to a `tubular shaft (Q) which revolves on the shaft (de) andis drivenV by a pulley (r). By

this means I am enabled to drive `the two shafts at different rates `suited to the several operations they perform; and there isincidentally a great saving of friction by running one shaft upon another which* is also running in the same direction. The eX- terior of the bolting cylinder (o) is divided horizontally into several compartments (s) which serve to assort the different products of the wheat, the lighterand finer particles' of which (the superne flour) passing through the upper part of the bolt into the chamber (8') and the coarser and inferior products passing through the bolt in to the` lower compartments, (8 sm) of which there may be as many as there are different qualities desired, such as fine. flour, middlings, ship stuff &c. The bran alone remains behind in the chamber (n) from which it escapes by a-spout. The several chambers (s) are provided with spouts to convey away their contents, which contents are carried to the spouts by annular carriers (t), being in the form of rings with cogged edges by which they are made torevolve b. pinions (u) on an upright shaft (o), w ich also gives motionin a similar manner tothe hop? per boy (l).` The annular carriers (t) have projections at intervals which push the flour round till it comes to the spout where it falls through. A passage for the escape ofthe air which is forced with the flour through the bolting cylinder, is provided by the `chamber (w)` into which are openings from the annulaf chambers (8); this passage is continued under the floor of the bolting chamber, to near the center hole thereof, and any iiour which may not have settledin the annular chambers, is thrown underneath, and is drawn again into the bolting chamber by the draft through the center hole (w) which supplies the fan with air.. y

The wings of the fan may be made with or without the brushes attheir extremities,

as it is found that in some instances a better effect may be produced without the brushes in which case the blast alone carries the flour through the bolt. The upper stone in this mill may be made the running one if desired. In some instances yI attach tov the an nular carriers pieces which rap on the posts which su port the bolting cloth, and thereby jan the c oth, and'detach any flour which may adhere to the cloth. I either use revolving knockers which are operated by stationary detents on the posts, or knockers attached to the posts and operated by detents on the annular carriers.

(y) is a revolvingknocker attached to one of the carriers (t) and pressed inwards by :1 spring. As the carrier revolves the knocker is lifted by the inclined part coming in con-- tact with the posts, and when the notch comes to the edge of the post, it suddenly springs inwards and the head of the knocker jars the bolting cloth for the purpose before mentioned.

Having thus described my improvements what I claim as new therein and desire to secure by Letters Patent is l. I claim, the arrangement of the hopper boy 7 revolving on the same center as the stone, and the chamber beneath the stone by which the iour is cooled as it is conveyed to the center opening of the bolt substantially as set forth.

2. I claim, the annular or endless conveyers for conveying the flour &c in the sev'- eral annular chambers to the spouts, the same being operated in the manner herein described.

3. I claim, in combination therewith the air passage (w) for returning the particles of Hour which would otherwise escape, to the center hole of the floor of the bolting chamber, to be drawn in again by the draft substantially in the manner set forth.

JAMES M. CLARK.

Witnesses THOMAS MATEE, AND. MoMAsTER. 

